The prime numbers have only two factors, i.e., one and the number itself. The factors of 9 are 1, 3, and 9. So 9 is not a prime number.

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Last updated on January 7th, 2025

9 in Words

Q: Write 9 in Roman numerals.

The number 9 in Roman numerals is written as IX. The number 9 is split into 10 - 1, so, X is 10 and I is 1.

Q: What is the square root of 9?

The square root of 9 is ±3. Because the product of multiplying 3 with itself is 9.

Q: What is the product of 9 and 15?

The product of two numbers is the result of multiplying the numbers. Here, the product of 9 and 15 is 135.

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Writing numbers in words seems to be easy, but sometimes it can be tricky. Numbers can be represented in numerals, words, Roman numerals, and so on. We use numbers in words in our daily lives to fill out forms and check. Here on this topic, let’s learn how to write 9 in words.

9 in words

Place value is what we need to consider when we write numbers in words. The number, 9 in words can be written as nine.

Tens	Ones
0	9

This is how we split the number, 9 according to the place value. So, here we have nine in one place. So, 9 in words is nine.

Learn more about the number 9

All the numbers have different mathematical properties. Now we can learn some properties of the number 9.

Mathematical Property	Answers
Is 9 a composite number?	Yes
Is 9 a prime number?	No
Is 9 a perfect cube?	No
Is 9 a perfect square?	Yes
Cube root of 9	2.08
Square root of 9	3
Is 9 an even number?	No
Is 9 an odd number?	Yes
Factors of 9	1, 3, 9
Prime factors of 9	3 × 3
Multiples of 9	9, 18, 27, 36, 45, 54, 63, 72, 81, 90

Common mistakes and how to avoid them in 9 in words

FAQs on 9 in words

1.Write 9 in Roman numerals.

2.Write 9 in words.

3.Is 9 a prime number?

4.What is the square root of 9?

5.What is the product of 9 and 15?

Important glossaries for 9 in words

Even numbers: Any numbers that are evenly divisible by 2 are even numbers.

Odd number: The numbers which are not divisible by 2 are odd numbers.

Prime numbers: The numbers that have only two factors, that is one and the number itself

Square root: The square root of a number is a number that when multiplied by the number gives the number

Factors: The factor of a number is any number that can divide the number evenly.

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Hiralee Lalitkumar Makwana

About the Author

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.